CN115635779A - Recording apparatus and recording method - Google Patents
Recording apparatus and recording method Download PDFInfo
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- CN115635779A CN115635779A CN202210842898.1A CN202210842898A CN115635779A CN 115635779 A CN115635779 A CN 115635779A CN 202210842898 A CN202210842898 A CN 202210842898A CN 115635779 A CN115635779 A CN 115635779A
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04551—Control methods or devices therefor, e.g. driver circuits, control circuits using several operating modes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
- B41J2/15—Arrangement thereof for serial printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
- B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
- B41J2/2117—Ejecting white liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J19/00—Character- or line-spacing mechanisms
- B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
- B41J19/20—Positive-feed character-spacing mechanisms
- B41J19/202—Drive control means for carriage movement
- B41J19/205—Position or speed detectors therefor
- B41J19/207—Encoding along a bar
Landscapes
- Ink Jet (AREA)
- Ink Jet Recording Methods And Recording Media Thereof (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention provides a recording apparatus and a recording method, the recording apparatus has a recording mode with excellent recording speed and image quality. The recording apparatus includes a white inkjet head, a non-white inkjet head, and a control unit that performs control to execute recording by performing a plurality of main scans in which an ink composition is ejected from the inkjet head and adheres to the recording medium while moving a relative position of the inkjet head with respect to the recording medium, the control unit executing: recording in a first recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by the same main scanning; and recording in a second recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by different main scans.
Description
Technical Field
The invention relates to a recording apparatus and a recording method.
Background
The ink jet recording method can record a high-definition image by a relatively simple apparatus, and is rapidly developed in various aspects. Among them, various studies have been made on improvement of image quality and the like. For example, patent document 1 discloses an image recording method for obtaining a high-quality image in which bleeding is suppressed, the image recording method including: a first step of recording an underlayer on a substrate using an underlayer-forming ink composition; and a second step of recording a color image layer on the base layer with a process color ink composition in a state where the volatile component remaining amount of the base layer is 5 to 50 mass%.
Patent document 1: japanese patent application laid-open No. 2010-158884
As described in patent document 1, there is an advantage that a recorded matter having good visibility of a color image can be obtained by recording a base layer and then a color image layer. On the other hand, in the method of laminating the base layer and the color image layer in the above-described manner, there is a problem that the recording speed of a portion necessary for the lamination becomes poor and a large-sized head is required. Further, when the recording head is excellent in terms of not requiring a large head and in terms of recording speed, there is a problem that excellent image quality cannot be obtained.
Disclosure of Invention
The present invention is a recording apparatus for recording on a recording medium, comprising: a white ink jet head that ejects a white ink composition containing a white coloring material and attaches the composition to the recording medium; a non-white ink jet head that ejects a non-white ink composition containing a non-white coloring material and attaches the composition to the recording medium; and a control unit that performs control for executing recording by performing a plurality of main scans including: and a controller that controls the inkjet head to move relative to the recording medium, and that controls the inkjet head to eject the ink composition from the inkjet head while the ink composition is being attached to the recording medium, the controller performing: recording based on a first recording mode, the first recording mode being: forming a layer containing the white ink composition and the non-white ink composition by attaching the white ink composition and the non-white ink composition to the same scanning area of the recording medium by the same main scanning; and recording based on a second recording mode, the second recording mode being: and attaching the white ink composition and the non-white ink composition to the same scanning area of the recording medium by different main scans, thereby forming a layer containing the white ink composition and a layer containing the non-white ink composition in a layered manner.
The present invention is a recording method using the above ink jet recording apparatus, wherein either one of the first recording mode and the second recording mode is selected, and recording is performed in the selected recording mode.
Drawings
Fig. 1 shows an example of a recording apparatus used in the present embodiment.
Fig. 2 shows an example of the configuration of the ink jet head.
Fig. 3 shows an example of the configuration of the ink jet head.
Fig. 4 shows an example of a flowchart of control of the recording method according to the present embodiment.
Fig. 5 shows an example of a recording apparatus used in the present embodiment.
Description of the reference numerals
1: a printer; 2: a recording head; 3: an ink cartridge; 4: a carriage; 5: a platen; 6: a heating mechanism; 7: a carriage moving mechanism; 8: a medium conveying mechanism; 9: a guide bar; 10: a linear encoder; m: a recording medium; CONT: a control unit.
Detailed Description
An embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail below with reference to the drawings as necessary, but the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. In the drawings, the same elements are denoted by the same reference numerals, and redundant description thereof is omitted. Unless otherwise specified, the positional relationship between the upper, lower, left, and right sides is based on the positional relationship shown in the drawings. The dimensional ratios in the drawings are not limited to the illustrated ratios.
In the present embodiment, the white ink jet head and the non-white ink jet head are simply referred to as "ink jet heads" without particularly distinguishing them. Similarly, the white ink composition and the non-white ink composition are not particularly distinguished from each other, and are simply referred to as "ink compositions".
Further, "main scanning" refers to the following operation: the ink composition is ejected from the inkjet head while moving the inkjet head relative to the recording medium, and adheres to the recording medium. The inkjet head can be mounted on a carriage, for example. The inkjet head may be moved by the carriage movement, in this case the movement of the inkjet head.
The "main scanning direction" is a moving direction of the inkjet head and refers to a width direction of the recording medium. Further, "main scanning" is movement of the relative position of the inkjet head with respect to the recording medium, and may be movement of the inkjet head with respect to the recording medium, or movement of the recording medium with respect to the inkjet head. The direction of this movement of the relative position is the main scanning direction. The movement of the relative position of the inkjet head with respect to the recording medium may also be referred to as the movement of the relative position of the recording medium with respect to the inkjet head. That is, the relative position of the inkjet head and the recording medium is moved.
On the other hand, "sub-scanning" refers to an operation of moving the relative position of the inkjet head and the recording medium in the sub-scanning direction. The "sub-scanning direction" refers to a direction intersecting the main scanning direction.
For example, the ink composition is attached to a certain region of the recording medium in the main scanning, the recording medium is moved slightly in the sub-scanning, for example, and the next main scanning is performed, whereby the ink composition is attached adjacent to or partially overlapping the ink composition attached first, and recording can be performed by repeating the above operations. The "sub-scanning" is also a movement of the relative position of the inkjet head with respect to the recording medium, and may be a movement of the inkjet head with respect to the recording medium or a movement of the recording medium with respect to the inkjet head. The direction of this relative movement is the sub-scanning direction.
Recording can be performed by performing main scanning and sub-scanning a plurality of times, respectively. For example, the main scanning and the sub-scanning may be alternately repeated.
1. Recording apparatus
The recording apparatus of the present embodiment performs recording on a recording medium, and includes: a white ink jet head that ejects a white ink composition containing a white coloring material and attaches the composition to a recording medium; a non-white ink jet head which ejects a non-white ink composition containing a non-white coloring material and attaches the composition to a recording medium; and a control unit that performs control to execute recording by performing a plurality of main scans: the control unit performs scanning for ejecting the ink composition from the inkjet head while moving the relative position of the inkjet head with respect to the recording medium and adhering the ink composition to the recording medium, the control unit performing: a first recording mode in which a layer containing a white ink composition and a non-white ink composition is formed by attaching the white ink composition and the non-white ink composition to the same scanning area of a recording medium by the same main scanning; and a second recording mode in which a layer containing the white ink composition and a layer containing the non-white ink composition are formed in a layered manner by attaching the white ink composition and the non-white ink composition to the same scanning region of the recording medium by different main scans.
Conventionally, a white ink layer and a non-white ink layer are formed by stacking and the white ink layer is used as a concealing layer to record a high quality image. However, there are the following problems: if the white ink layer and the non-white ink layer are formed in superposition, the recording speed is reduced accordingly. The inventors of the present invention have studied this aspect and found that: even if a recorded matter in which a single ink layer containing a white ink composition and a non-white ink composition is formed on a recording medium without forming a white ink layer and a non-white ink layer in an overlapping manner as in the conventional art, an image having excellent color developability without unevenness in darkness is obtained.
Therefore, in the present embodiment, it is possible to perform: a first recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by the same main scanning; and a second recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by different main scans.
That is, it is possible to perform: a first recording mode for forming an image with a single ink layer containing a white ink composition and a non-white ink composition while placing importance on a recording speed; and a second recording mode for forming an image by forming a white ink layer and a non-white ink layer in an overlapping manner as in the conventional manner while emphasizing image quality. That is, recording by the first recording mode and recording by the second recording mode can be performed.
An example of a recording apparatus used in the present embodiment will be described below with reference to the drawings, but the recording apparatus used in the present embodiment is not limited to the following embodiment.
Fig. 1 shows an example of a recording apparatus used in the present embodiment. In fig. 1, a carriage-mounted printer in which an ink cartridge is mounted on a carriage is described as an example, but the recording apparatus is not limited to the carriage-mounted printer, and may be a carriage-unmounted printer in which an ink cartridge is fixed to the outside. In the case of the carriage non-mounted type, the ink cartridge 3 is mounted in a place other than the carriage 4, and the ink may be supplied from the ink cartridge 3 to the recording head 2 via an ink supply tube.
The printer to be described below is a serial printer in which an ink jet head for recording is mounted on a carriage that moves in a predetermined direction, and liquid droplets are discharged onto a recording medium by the movement of the ink jet head in accordance with the movement of the carriage. The serial type may be a type in which main scanning is performed in a direction intersecting a sub-scanning direction which is a conveying direction of the recording medium, or may be a lateral type in which an ink jet head is alternately moved in the main scanning direction and the sub-scanning direction with respect to a fixed recording medium.
As shown in fig. 1, the printer 1 includes: the recording head 2, the ink cartridge 3, the carriage 4, the platen 5, the heating mechanism 6, the carriage moving mechanism 7, the medium conveying mechanism 8, the guide bar 9, the linear encoder 10, and the control portion CONT.
1.1. Ink jet head
The recording head 2 is a unit for attaching each ink composition to the recording medium M, and includes first nozzles for ejecting a white ink composition and second nozzles for ejecting a non-white ink composition on a surface facing the recording medium M to which each ink composition is attached. The plurality of nozzles are arranged in a row, thereby forming a nozzle surface on the nozzle plate surface. In fig. 1, the recording head 2 is used as both a white ink-jet head and a non-white ink-jet head.
Examples of the method of ejecting the white ink composition and the non-white ink composition from the nozzles include the following piezoelectric method: the piezoelectric element applies pressure and a recording information signal to the white ink composition and the non-white ink composition at the same time, and droplets of the white ink composition and the non-white ink composition are ejected and recorded. Note that, as the recording head 2, a dot impact head, a thermal transfer head, or the like may be used in addition to the ink jet head.
Further, the ink jet head of the present embodiment may be of the following structure: nozzles for ejecting the white ink composition and nozzles for ejecting the non-white ink composition are arranged in a lateral direction so that the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by the same relative scanning. Therefore, the overall size of the ink jet head can be reduced as compared with the conventional head structure based on the lamination.
Fig. 2 to 3 show a nozzle formation surface of the recording head 2. The recording apparatus of the present embodiment can perform both recording in the first recording mode and recording in the second recording mode by using one recording head 2 by controlling the nozzles of the recording head 2 by the control unit CONT.
The nozzle control of the recording head 2 when the first recording mode is executed will be described with reference to fig. 2. In the inkjet head shown in fig. 2, the ink composition is ejected from the entire nozzle rows in the sub-scanning direction SS. When the white ink composition is discharged from the nozzle row N1 and the non-white ink composition is discharged from the nozzle row N2 to scan, the nozzle row N1 and the nozzle row N2 have a portion overlapping in the sub-scanning direction SS when projected in the main scanning direction MS. In this case, the white ink composition and the non-white ink composition are attached to the same region of the recording medium by the same main scanning of the inkjet head.
In the case of the above example, the same region is a portion where the nozzle row N1 and the nozzle row N2 overlap each other in the sub-scanning direction SS when the nozzle row N1 that ejects the white ink and the nozzle row N2 that ejects the non-white ink are projected in the main scanning direction MS.
Further, nozzle control of the recording head 2 when the second recording mode is executed will be described with reference to fig. 3. In the inkjet head shown in fig. 3, the areas of the blocks B1 and B2 are divided in the sub-scanning direction SS. In this inkjet head, the type of liquid droplets to be ejected can be changed for each block and nozzle row. For example, in fig. 3, the inkjet head may be controlled to discharge white ink in the block B1 of the nozzle row N1 and to discharge non-white ink in the block B2 of the nozzle row N2.
In this case, in a certain main scan, the white ink discharged from the block B1 of the nozzle row N1 adheres to the recording medium, the recording medium M slightly moves in the sub-scanning direction SS, and in the next main scan, the non-white ink discharged from the block B2 of the nozzle row N2 adheres to the recording medium so as to be layered on the already adhered white ink. Thus, the white ink composition and the non-white ink composition are attached to the same region of the recording medium by different main scans of the inkjet head.
In the above example, the same region is a portion where the white ink composition and the non-white ink composition are laminated and attached by different main scans.
As another example of the second recording mode, for example, in the nozzle control of fig. 2, a white ink composition is discharged from the nozzle row N1, the white ink composition is discharged and attached to the recording medium, an ink layer of the white ink composition is formed, then, the recording medium is rewound, a non-white ink composition is discharged from the nozzle row N2 so as to overlap the ink layer of the white ink composition, and the non-white ink composition is discharged and attached.
The nozzle control of the recording head 2 is not limited to the above-described embodiment, and for example, in the embodiment of fig. 3, the white ink is discharged from the block B1 of the nozzle row N1, and the non-white ink is discharged from the block B1 of the nozzle row N2, whereby the white ink composition and the non-white ink composition are attached to the same region of the recording medium by the same main scanning, and the first recording mode is executed. For example, in the embodiment of fig. 2, the second recording mode may be executed in which the white ink is discharged from the nozzle array N1 in a certain main scanning, the recording medium M is not moved in the sub-scanning direction SS, and the non-white ink discharged from the nozzle array N2 is attached to the recording medium so as to be layered on the white ink already attached in the next main scanning.
In fig. 1, the ink cartridge 3 for supplying the white ink composition or the like to the recording head 2 is constituted by four independent ink cartridges. For example, one of the four ink cartridges is filled with a white ink composition, and the other ink cartridges are filled with different types of non-white ink compositions. The ink cartridge 3 is attached to be detachable with respect to the recording head 2. In the example of fig. 1, the number of ink cartridges is four, but the number of ink cartridges is not limited to this, and a necessary number of ink cartridges can be mounted.
Further, a platen 5 is disposed below the recording head 2, and the recording medium M is conveyed to the platen 5. The recording apparatus 1 may further include a heating mechanism 6 for heating the recording medium M. The heating mechanism is one of the drying mechanisms.
The heating mechanism 6 may be provided at a position where it can heat the recording medium M, and the position of the heating mechanism is not particularly limited. In the example of fig. 1, the heating mechanism 6 is provided on the platen 5 at a position facing the recording head 2. If the heating mechanism 6 is provided at a position facing the recording head 2, the position of the white ink composition or the non-white ink composition on the recording medium M can be reliably heated, and the white ink composition or the non-white ink composition on the recording medium M can be effectively dried.
Examples of the heating mechanism 6 include a print heater mechanism for heating the recording medium M by bringing the recording medium M into contact with a heat source, a mechanism for irradiating infrared rays or microwaves, which are electromagnetic waves having a maximum wavelength of about 2450MHz, a drying mechanism for blowing hot air, and a platen heater.
The heating of the recording medium M by the heating mechanism 6 is performed before, during, or immediately after the droplets discharged from the nozzles of the recording head 2 adhere to the recording medium M. The control of each condition of heating, for example, the timing of heating, the heating temperature, the heating time, and the like are performed by the control unit CONT.
1.2. Sliding frame
The carriage 4 can mount a white ink-jet head and a non-white ink-jet head as the recording head 2, and can detachably mount the ink cartridges 3 that supply the respective ink compositions to the recording head 2.
The carriage 4 is mounted on a guide rod 9 as a support member extending in the main scanning direction, and is moved in the main scanning direction along the guide rod 9 by a carriage moving mechanism 7. By discharging the ink composition from the recording head 2 mounted on the carriage 4 while relatively moving the carriage 4 with respect to the recording medium, the ink composition can be made to adhere to the recording medium M.
The relative movement of the carriage 4 is not limited as long as one of the carriage 4 and the recording medium M is moved to a position relative to the other. Therefore, in the example of fig. 1, the carriage 4 moves in the main scanning direction, but the present invention is not limited to this, and a system (transverse scanning system) may be used in which main scanning and sub-scanning by head movement are performed a plurality of times on a fixed recording medium.
The carriage moving mechanism 7 moves the carriage 4 in the medium width direction of the recording medium M. The medium conveyance mechanism 8 conveys the recording medium M in the medium conveyance direction. Here, the medium width direction is a main scanning direction MS as an operation direction of the recording head 2. The medium conveyance direction is a direction orthogonal to the main scanning direction MS, and is a sub-scanning direction SS in which the recording medium M moves.
1.3. Control unit
The control unit CONT can control the operation of the entire printer 1. For example, the control unit CONT can perform control for executing recording by performing a plurality of times of main scanning for ejecting each ink composition from the recording head 2 and attaching the ink composition to the recording medium M while relatively moving the carriage 4 with respect to the recording medium.
Particularly in the present embodiment, the control unit CONT executes: a first recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by the same main scanning; and a second recording mode in which the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by different main scans.
1.3.1. A first recording mode
In the first recording mode, the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by the same main scanning, thereby forming a layer containing the white ink composition and the non-white ink composition. This eliminates the need to stack a layer of the ink composition, and thus can improve the recording speed. Further, on this basis, in the image obtained in the first recording mode, in the case where the recording medium is transparent, the image seen from the front surface and the image seen from the back surface look the same, respectively. Therefore, for example, in the case of a recorded matter used by being stuck to a window, glass, or the like, an image that can be seen from both front and back sides can be obtained.
In the first recording mode, main scanning may be performed for the same area by attaching the white ink composition and the non-white ink composition to the scanning area a plurality of times. That is, it is preferable that after a layer containing a white ink composition and a non-white ink composition is attached to a certain region on a recording medium by a certain main scanning, a layer containing a white ink composition and a non-white ink composition is further attached to the layer by another main scanning in an overlapping manner. In this case, the main scanning for attaching the white ink composition and the non-white ink composition is performed a plurality of times over the same area. As the number of times of scanning increases, the ink can be deposited in a desired area by dividing into a plurality of times (multiple paths), and the image quality of the obtained recorded matter tends to be further improved.
In addition, the number of times the ink jet head passes over an arbitrary area when recording the area is also referred to as a "path". For example, when main scanning is performed four times to attach the white ink composition and the non-white ink composition to the same region, the number of paths is referred to as 4 paths or the like. For example, in the example of fig. 2, when the length of one sub-scan in the sub-scanning direction is one-fourth of the length of the nozzle row N1 in the sub-scanning direction, four scans are performed on a rectangular scanning region having the length of one sub-scan in the sub-scanning direction and extending in the main scanning direction. The number of times of scanning when observed in the above manner is referred to as the number of scans, the number of paths, or the like. The number of scans is 1 or more, preferably 2 or more, more preferably 3 or more, further preferably 4 or more, and particularly preferably 8 or more. The upper limit is not limited, but is preferably 24 or less, and more preferably 12 or less.
The number of times of scanning is set for each ink type.
In the first recording mode, the layer containing the white ink composition may be formed by a main scanning different from the main scanning for forming the layers containing the white ink composition and the non-white ink composition, and the layer containing the white ink composition and the non-white ink composition and the layer containing the white ink composition may be formed by stacking. Thus, an image having higher color developability can be obtained by forming a layer containing the white ink composition. The formation of the layer containing the white ink composition may be performed before or after the formation of the layer containing the white ink composition and the non-white ink composition. In the case of the above, the image is visually recognized from the recording surface side of the recording medium to be used as a recorded matter. In the case of the subsequent operation, the image is visually recognized from the opposite side of the recording surface of the recording medium, and the recorded matter is used.
1.3.2. Second recording mode
In the second recording mode, the white ink composition and the non-white ink composition are attached to the same scanning area of the recording medium by different main scans, thereby forming a layer containing the white ink composition and a layer containing the non-white ink composition in a stacked manner. Accordingly, since the concealing property is ensured by the layer containing the white ink composition, the color developability and the visibility of the non-white ink composition formed thereon are further improved, and high-quality image quality can be obtained.
In the second recording mode, the order of the white ink composition and the non-white ink composition is not limited as long as they are deposited by different main scans. For example, when a white ink composition is first applied and a non-white ink composition is applied thereto, an image can be formed as viewed from the ink application surface side. In contrast, when the recording medium is transparent, an image viewed from the non-adhering side of the ink can be formed when the non-white ink composition is adhered first and the white ink composition is adhered thereon.
In the second recording mode, different main scans in which the white ink composition and the non-white ink composition are attached to the scanning area may be performed a plurality of times for the same scanning area. For example, it is conceivable to record the white ink composition in 4 passes and thereafter record the non-white ink composition in 4 passes.
1.3.3. Amount of adhesion
Preferably, the control unit CONT controls the ratio of the amount of adhesion of the white ink composition to the amount of adhesion of the non-white ink composition of 100 mass% in the area where the white ink composition and the non-white ink composition adhere to the recording medium, to be a ratio a, and when calculating the ratio a, to be smaller in the first recording mode than in the second recording mode than in the ratio A2.
The ratio of the deposition amounts indicates the deposition amount of the white ink composition/the deposition amount of the non-white ink composition in a ratio, and the deposition amounts are 100% by mass when they are equal to each other.
Since the first recording mode forms the ink layer mixed with the white ink, the recorded matter is easily whitened as compared with the second recording mode even if the same amount of the white ink composition is used. In this regard, by performing the control in the above manner, it is possible to obtain an image with higher image quality in the first recording mode and the second recording mode. The unit region in the case of a predetermined amount of adhesion is a region having a predetermined area, and can be, for example, a2 × 2mm region.
The ratio A1 of the first recording mode based on the control by the control unit CONT is preferably less than 80% by mass, more preferably 5 to 75% by mass, even more preferably 10 to 75% by mass, even more preferably 30 to 70% by mass, and even more preferably 35 to 65% by mass. When the ratio A1 is less than 80 mass%, the color rendering property tends to be further improved, and the unevenness of shade tends to be further reduced. When the ratio A1 is within the above range or more, the visibility tends to be further improved.
In the first recording mode, when the amount of adhesion of the non-white ink composition in the region in which the white ink composition and the non-white ink composition are adhered is the largest amount of adhesion of the non-white ink composition in the region in which the white ink composition and the non-white ink composition are adhered is defined as the maximum amount of adhesion of the non-white ink B1, the amount of adhesion of the non-white ink composition in the region in which the white ink composition and the non-white ink composition are adhered is in a region from the region of the maximum amount of adhesion of the non-white ink B1 to 40 mass% of the maximum amount of adhesion of the non-white ink B, and the ratio of the amounts of adhesion is preferably in the above range.
In addition, in the region where the white ink composition and the non-white ink composition are attached, the region where the amount of attachment of the non-white ink composition is less than 40 mass% of the maximum amount of attachment B1 of the non-white ink is a region where the color of the image of the non-white ink composition is relatively light and the quality of the original image quality is not significant, but the ratio of the amount of attachment may be set to the above range, more than the above range, or less than the above range in this region. When the color rendering property is prioritized, the range may be set to the above range or less. When priority is given to visibility, the above range or more may be set.
The ratio A2 of the second recording mode based on the control by the control unit CONT is preferably 80% by mass or more, more preferably 85 to 200% by mass, and still more preferably 90 to 160% by mass. When the ratio A2 is 80% by mass or more, the visibility tends to be further improved. Further, when the ratio A2 is 200 mass% or less, the unevenness of color density tends to be further reduced, and the adhesiveness tends to be further improved.
In the second recording mode, when the amount of adhesion of the non-white ink composition in the region where the amount of adhesion of the non-white ink composition is the largest in the region where the white ink composition and the non-white ink composition are adhered to the recording medium is set to the non-white ink maximum adhesion amount B2, in the region where the amount of adhesion of the non-white ink composition is smaller than the non-white ink maximum adhesion amount B2, the ratio of the amounts of adhesion is preferably within the above range or exceeds the above range, that is, the above range or more.
In the second recording mode, even when the ratio of the amount of adhesion is large, the visibility and the color developability tend to be relatively excellent, and even when the range of the amount of adhesion is not less than the above range, the visibility and the color developability can be excellent.
In the first recording mode, the maximum adhesion amount of the white ink composition in the region where the white ink composition and the non-white ink composition are superimposed is preferably 10mg/inch 2 Hereinafter, more preferably 8mg/inch 2 The following.
The lower limit of the maximum deposition amount of the white ink composition is preferably 0.50mg/inch 2 Above, more preferably 1.0mg/inch 2 Above, more preferably 3.0mg/inch 2 Above, it is particularly preferably 5.0mg/inch 2 The above.
The maximum adhesion amount of the non-white ink composition is not particularly limited as long as it is an adhesion amount corresponding to an image to be recorded, but the ratio A1 is preferably within the above-described preferred range.
This can suppress excessive whitening of the obtained image, and tends to further improve the visibility and color rendering property.
In the second recording mode, the maximum amount of the white ink composition deposited in the region where the white ink composition and the non-white ink composition are deposited in overlap is preferably 15mg/inch 2 Hereinafter, it is more preferable that the range is the same as the preferable range in the first recording mode. The maximum deposition amount of the non-white ink composition may be the same as the preferable range in the first recording mode.
The linear encoder 10 detects the position in the main scanning direction of the carriage 4 by a signal. The signal detected by the linear encoder 10 is sent to the control unit CONT as position information. The control unit CONT recognizes the scanning position of the recording head 2 based on the position information from the linear encoder 10, and controls the recording operation, that is, the ejection operation, and the like of the recording head 2. The control unit CONT is configured to variably control the movement speed of the carriage 4.
1.4. Ink composition
The white ink composition used in the present embodiment contains a white coloring material, and the non-white ink composition contains a non-white coloring material. The white ink composition and the non-white ink composition may be water-based ink compositions containing water as a main solvent or solvent-based ink compositions containing an organic solvent as a main solvent. The components of the ink composition will be exemplified below by the water-based ink composition, but the components constituting the ink composition of the present embodiment are not limited to the following components.
The white ink composition and the non-white ink composition used in the present embodiment may be solvent-based inks or water-based inks, but each is preferably a water-based ink. The water-based ink has high environmental compatibility with respect to a solvent-based ink in which the content of an organic solvent is small. In contrast, the water-based ink tends to have the following characteristics: white ink and non-white ink are easily mixed, and a decrease in color developability and shading unevenness are easily caused, and particularly, an obtained image is easily whitened. Thus, the present invention is particularly useful. In addition, the term "aqueous" as used in the case of an ink means that the ink contains at least water as a main solvent component. The content of water contained in the ink or the like is 40 mass% or more, preferably 50 mass% or more. More preferably 60 to 98 mass%.
The nonaqueous ink contains an organic solvent as a main solvent component. The content of the organic solvent in the nonaqueous ink is preferably 40% by mass or more, and more preferably 50 to 98% by mass. The content of water in the nonaqueous ink is preferably 1% by mass or less, and more preferably 0.5% by mass or less. The components other than the solvent component of the nonaqueous ink may be the same as those which can be contained in the aqueous ink described later.
In the case of an aqueous ink composition, the white ink composition and the non-white ink composition may contain water, an organic solvent, a surfactant, resin particles, and the like, as necessary, in addition to the colorant. The components of the ink composition will be described in detail below by taking an aqueous ink as an example.
1.4.1. White colorant
The white coloring material is not particularly limited, and examples thereof include c.i. pigment white 6, 18, 21, silica, alumina, titanium dioxide, zinc oxide, antimony oxide, magnesium oxide, zirconium oxide, zinc sulfide, barium sulfate, calcium carbonate, and other white inorganic pigments. In addition to the white inorganic pigment, a white organic pigment such as white hollow resin particles or polymer particles can be used.
In the above examples, titanium dioxide is preferably used as the white coloring material from the viewpoint of satisfactory whiteness and the like. The white coloring material may be used alone or in combination of two or more.
The content of the white coloring material is preferably 1.0% by mass or more, more preferably 3.0% by mass or more, further preferably 5.0% by mass or more, and particularly preferably 8.0% by mass or more, based on the total amount of the white ink composition. The content of the white coloring material is preferably 20% by mass or less, more preferably 15% by mass or less, further preferably 12.5% by mass or less, and particularly preferably 10% by mass or less, based on the total amount of the white ink composition. When the content of the white coloring material is in the above range, images with higher image quality can be obtained in the first recording mode and the second recording mode.
In the second recording mode, the white ink composition may be used for the purpose of concealing the background of an image. On the other hand, the first recording mode is used for the purpose of improving the visibility itself of an image obtained by using a non-white ink composition in combination with the concealing property, not for the purpose of improving the concealing property. Therefore, the content of the white coloring material in the white ink composition can be further reduced as compared with the case where the background is intended to be hidden. This makes it possible to obtain a sufficient visual recognition of an image, and the white coloring material is easy to have good dispersion stability and is hard to settle. Further, filling and deterioration in image quality are more excellent, and therefore, filling and deterioration in image quality are preferable.
The white coloring material is preferably stably dispersible in the dispersion medium, and therefore may be dispersed using a dispersant. The dispersant may be a resin dispersant or the like, and is selected from dispersants that can improve the dispersion stability of the white coloring material in the white ink composition containing the white coloring material. The white coloring material may be used as a self-dispersible pigment by oxidizing the surface of the pigment with ozone, hypochlorous acid, fuming sulfuric acid, or the like, or by modifying the surface of the pigment particles by sulfonation.
1.4.2. Non-white colorant
The non-white coloring material is not particularly limited as long as it is a coloring material other than the above-mentioned white coloring material, and examples thereof include: inorganic pigments such as carbon blacks (c.i. pigment black 7) such as furnace black, lamp black, acetylene black and channel black; organic pigments such as quinacridone pigments, quinacridone quinone pigments, dioxazine pigments, phthalocyanine pigments, anthrapyrimidine pigments, anthanthrone pigments, indanthrone pigments, xanthanthrone pigments, perylene pigments, diketopyrrolopyrrole pigments, perinone pigments, quinophthalone pigments, anthraquinone pigments, thioindigo pigments, benzimidazolone pigments, isoindolinone pigments, azomethine pigments, and azo pigments. The non-white coloring material may be used alone or in combination of two or more.
The content of the non-white coloring material is preferably 0.5 to 10% by mass, more preferably 0.5 to 7.5% by mass, and still more preferably 0.5 to 6.0% by mass, based on the total amount of the non-white ink composition. Still more preferably 1.0 to 5.0 mass%. When the content of the non-white coloring material is within the above range, the color developability and the visibility are further improved, and images with higher image quality can be obtained in the first recording mode and the second recording mode.
The non-white coloring material is preferably stably dispersible in the dispersion medium, and therefore may be dispersed using a dispersant. The dispersant may be a resin dispersant, and is selected from dispersants that can improve the dispersion stability of the non-white coloring material in the non-white ink composition containing the non-white coloring material. The non-white coloring material may be used as a self-dispersible pigment by modifying the surface of pigment particles by oxidizing the pigment surface with ozone, hypochlorous acid, fuming sulfuric acid, or the like, or by sulfonating the pigment particles.
The non-white ink composition containing the non-white coloring material is not limited, and examples thereof include cyan ink, yellow ink, magenta ink, and black ink.
1.4.3. Water (W)
The content of water is preferably 45 to 98% by mass with respect to the total amount of the ink composition. Further, it is preferably 55 to 90% by mass, more preferably 60 to 85% by mass, and still more preferably 65 to 80% by mass.
1.4.4. Organic solvent
The organic solvent is not particularly limited as long as it is a water-soluble organic solvent, and examples thereof include: polyhydric alcohols such as glycerin and other triols; glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1, 3-propanediol, 1, 2-butanediol, 1, 3-butanediol, 1, 2-pentanediol, 1, 2-hexanediol, 1, 4-butanediol, 1, 5-pentanediol, and 1, 6-hexanediol; glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, and triethylene glycol monobutyl ether; nitrogen-containing solvents such as 2-pyrrolidone, N-methyl-2-pyrrolidone, and N-ethyl-2-pyrrolidone; alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, t-butanol, isobutanol, n-pentanol, 2-pentanol, 3-pentanol, and t-pentanol. One kind of the organic solvent may be used alone, or two or more kinds may be used in combination.
Diols are compounds having two hydroxyl groups in the molecule. The diols include alkanediols in which an alkane is substituted with two hydroxyl groups, and condensates obtained by intermolecular condensation of 2 or more hydroxyl groups of the alkanediol.
The number of carbon atoms in the molecule of the diol is preferably 2 to 10, more preferably 3 to 8, still more preferably 3 to 6, and particularly preferably 3 to 5.
As the alkanediol, 1, 2-alkanediol, both terminal alkanediol and the like are preferred.
Examples of the nitrogen-containing solvent include an amide solvent. Examples of the amide solvent include acyclic amides, cyclic amides, and the like.
The cyclic amides include lactams, and for example, pyrrolidones such as the above-mentioned lactams, 1-propyl-2-pyrrolidone and 1-butyl-2-pyrrolidone, N-methyl-epsilon-caprolactam, N-cyclohexyl-2-pyrrolidone and beta-propiolactam.
Examples of the acyclic amides include: <xnotran> 3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- ,3- -N, N- , N, N- , N, N- , N- , N, N- , N, N- , N, N- , </xnotran> N, N-dimethylacetamide, N-diethylacetamide, N-dimethylpropionamide, etc.
The polyhydric alcohol of triol or more is a compound having three or more hydroxyl groups in the molecule, and glycerin is an example.
The glycol ether is a compound obtained by etherifying one or two of the hydroxyl groups of an alkanediol in which an alkane is substituted with two hydroxyl groups or a condensate obtained by intermolecular condensation of 2 or more molecules of the alkanediol. Etherification is either monoetherification or diethification. The etherification is preferably alkyl etherification. Glycol ethers are compounds having one or no hydroxyl group in the molecule. Examples of the glycol ethers include the above glycol ethers.
Alcohols are compounds in which an alkane is substituted with one hydroxyl group, having one hydroxyl group in the molecule. Examples of the alcohol include the above-mentioned alcohols.
Among the organic solvents, preferred are a glycol-based solvent such as propylene glycol, 1, 3-propylene glycol and 1, 2-hexanediol, a nitrogen-containing solvent such as 2-pyrrolidone and glycerol. By using such an organic solvent, the image quality and recording speed of the obtained recorded matter tend to be further improved.
The content of the organic solvent is preferably 1.0 to 40% by mass, more preferably 3.0 to 30% by mass, even more preferably 5.0 to 15% by mass, and even more preferably 7.5 to 15% by mass, based on the total amount of the ink composition.
The content of the organic solvent of the diol may be set to the above range.
The content of the nitrogen-containing solvent is preferably 40% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, and particularly preferably 2% by mass or less, relative to the total amount of the ink composition. The lower limit is 0 mass% or more.
When the content of the organic solvent is in the above range, the color developability and recording speed of the obtained recorded matter tend to be further improved.
When the content of the nitrogen-containing solvent is within the above range, the image quality, adhesion, and the like are more excellent, and therefore, the content is preferable.
The organic solvent preferably has a normal boiling point of 150 to 280 ℃, preferably 160 to 270 ℃, and preferably 170 to 260 ℃. More preferably 180 to 200 ℃ and still more preferably 190 to less than 200 ℃.
When the normal boiling point of the organic solvent is within the above range, the adhesion tends to be further improved.
In particular, the content of the organic solvent having a normal boiling point of less than 200 ℃ in the organic solvents contained in the white ink composition and the non-white ink composition is preferably 50% by mass or more, particularly preferably 55% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass or more, based on the total amount of the organic solvents. The upper limit of the content of the organic solvent having a normal boiling point of less than 200 ℃ is 100 mass% or less, preferably 95 mass% or less, and may be 90 mass% or less. In particular, the content of the organic solvent having a normal boiling point of less than 200 ℃ in the organic solvent contained in the white ink composition is preferably within the above range. When the content of the organic solvent having a normal boiling point of less than 200 ℃ is in the above range, the adhesion tends to be further improved.
The white ink composition and the non-white ink composition preferably contain an organic solvent having a normal boiling point of less than 200 ℃ and an organic solvent having a normal boiling point of 200 ℃ or higher.
The organic solvent having a normal boiling point in the above range is preferably a glycol-based organic solvent.
The maximum value of the standard boiling point of the organic solvent contained in the white ink composition or the non-white ink composition is preferably 280 ℃ or less. Further, it is preferably 250 ℃ or lower, more preferably 240 ℃ or lower, and still more preferably 230 ℃ or lower. The maximum value of the normal boiling point of the organic solvent is preferably 150 ℃ or higher, and more preferably 160 ℃ or higher. In particular, the maximum value of the standard boiling point of the organic solvent contained in the white ink composition is preferably within the above range. When the maximum value of the standard boiling point is within the above range, the adhesiveness tends to be further improved.
The weighted average of the normal boiling points of the organic solvents contained in the white ink composition and the non-white ink composition is preferably 290 ℃ or less, and more preferably 250 ℃ or less. Further, it is preferably 230 ℃ or lower, more preferably 220 ℃ or lower, still more preferably 210 ℃ or lower, and particularly preferably 200 ℃ or lower. The weighted average of the normal boiling points of the organic solvents is preferably 150 ℃ or higher, and more preferably 160 ℃ or higher. In particular, the weighted average of the normal boiling points of the organic solvents contained in the white ink composition is preferably within the above range. When the weighted average of the normal boiling points is in the above range, the adhesiveness tends to be further improved.
In particular, the white ink composition and the non-white ink composition are each an aqueous ink composition, and preferably do not contain more than 2% by mass of an organic solvent of a diol or a polyol having a normal boiling point of more than 280 ℃. "not included by more than 2% by mass" means that the alkyl polyol is 0% by mass or included within a range not exceeding, if included. Further, the content is preferably not more than 1% by mass, more preferably not more than 0.5% by mass.
The content of the organic solvent having a normal boiling point exceeding 280 ℃ may be taken as the above range.
1.4.5. Surface active agent
The surfactant is not particularly limited, and examples thereof include an acetylene glycol surfactant, a fluorine surfactant, and a silicone surfactant. Among them, silicone surfactants are preferable. This tends to further suppress the unevenness of the density of the obtained recorded matter.
The acetylene glycol-based surfactant is not particularly limited, and is preferably at least one selected from the group consisting of alkylene oxide adducts of 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol and 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol, and alkylene oxide adducts of 2, 4-dimethyl-5-decyne-4-ol and 2, 4-dimethyl-5-decyne-4-ol.
The fluorine-based surfactant is not particularly limited, and examples thereof include perfluoroalkyl sulfonate, perfluoroalkyl carboxylate, perfluoroalkyl phosphate, perfluoroalkyl ethylene oxide adduct, perfluoroalkyl betaine, and perfluoroalkyl amine oxide compound.
Examples of the silicone surfactant include polysiloxane compounds and polyether-modified organosiloxanes.
The content of the surfactant is preferably 0.1 to 4.0% by mass, more preferably 0.3 to 3.0% by mass, and still more preferably 0.5 to 2.0% by mass, based on the total amount of the ink composition. This tends to further suppress the unevenness of the density of the obtained recorded matter.
1.4.6. Resin particle
By using the resin particles, the adhesion of the obtained image is further improved. The resin particles are not particularly limited, and examples thereof include resin particles composed of urethane resins, acrylic resins (including styrene-acrylic resins), fluorene resins, polyolefin resins, rosin-modified resins, terpene resins, polyester resins, polyamide resins, epoxy resins, vinyl chloride-vinyl acetate copolymers, ethylene-vinyl acetate resins, and the like. The resin particles may be in the form of an emulsion.
Among them, preferred are urethane-based resins, acrylic-based resins, and polyolefin-based resins. These resin particles are often handled in the form of an emulsion, but may be in the form of a powder. Further, the resin particles may be used singly or in combination of two or more groups.
The urethane resin is a generic term for resins having a urethane bond. The urethane resin may be a polyether urethane resin having an ether bond in the main chain, a polyester urethane resin having an ester bond in the main chain, a polycarbonate urethane resin having a carbonate bond in the main chain, or the like, in addition to the urethane bond.
The acrylic resin is a general term for polymers obtained by polymerizing at least acrylic monomers such as (meth) acrylic acid and (meth) acrylic esters as one component, and examples thereof include resins obtained from acrylic monomers, and copolymers of acrylic monomers and other monomers. For example, an acrylic-vinyl resin which is a copolymer of an acrylic monomer and a vinyl monomer is exemplified. Examples of the vinyl monomer include styrene and the like. As the acrylic monomer, acrylamide, acrylonitrile, or the like can be used.
Among them, styrene-acrylic resins are preferable. The styrene-acrylic resin is not particularly limited, and examples thereof include a styrene-acrylic acid copolymer, a styrene-methacrylic acid-acrylic ester copolymer, a styrene- α -methylstyrene-acrylic acid copolymer, and a styrene- α -methylstyrene-acrylic acid-acrylic ester copolymer. By using such a resin, the image quality and adhesion of the obtained recorded matter tend to be further improved.
The polyolefin resin has an olefin such as ethylene, propylene, or butene in the structural skeleton, and a known polyolefin resin can be suitably used.
The content of the resin particles is preferably 0.5 to 15% by mass, preferably 1.0 to 10% by mass, and more preferably 2.5 to 7.5% by mass, based on the total amount of the ink composition. When the content of the resin particles is within the above range, the adhesion of the obtained recorded matter tends to be further improved.
1.4.7. Other ingredients
The ink composition may further contain components such as an antiseptic/antifungal agent, a rust inhibitor, a chelating agent, a viscosity modifier, an antioxidant, and an antifungal agent, as required.
1.5. Recording medium
The recording medium used in the present embodiment is not particularly limited, and examples thereof include an absorbent recording medium such as paper, film, and cloth, a low-absorbent recording medium such as printed paper, and a non-absorbent recording medium such as metal, glass, and polymer.
Among them, from the viewpoint of ink absorbency, a low-absorbency recording medium or a non-absorbent recording medium is preferable. Further, from the viewpoint of color, a non-white recording medium is preferable. Conventionally, such a recording medium forms a white ink layer and a non-white ink layer by stacking them, and records a high-quality image using the white ink layer as a concealing layer. Therefore, the use of the present invention can effectively exhibit the effect of the present invention of forming an image having excellent color rendering properties without unevenness in shade.
In this embodiment, the non-absorptive or low-absorptive recording medium means that 30msec from the start of contact in the "Bristow" method 1/2 The water absorption amount was 10mL/m 2 The following recording medium ". The bristol method is the most popular method for measuring the amount of liquid absorbed in a short time, and is also adopted by JAPAN pulp technology association (JAPAN TAPPI). The details of the test method are described in "JAPAN TAPPI pulp test method 2000 edition" Standard No.51 "paper and paperboard liquid absorbency test method-Bristol method".
Examples of the non-absorbent recording medium include a recording medium in which a base material such as paper is coated with plastic, a recording medium in which a base material such as paper is bonded with a plastic film, and a plastic film having no absorbent layer (receiving layer). Examples of the plastic material include polyvinyl chloride, polyethylene terephthalate, polycarbonate, polystyrene, polyurethane, polyethylene, and polypropylene.
Examples of the low-absorbency recording medium include a recording medium having a coating layer with low absorbency on the surface thereof. For example, known as coated paper. For example, as the recording medium whose substrate is paper, there can be mentioned printing paper such as coated paper, matte paper, and in the case where the substrate is a plastic film, there can be mentioned a recording medium whose surface is coated with a polymer or the like such as polyvinyl chloride, polyethylene terephthalate, polycarbonate, polystyrene, polyurethane, polyethylene, polypropylene, and the like, and a recording medium whose surface is coated with particles such as silica, titanium, and the like together with a binder.
As the recording medium, an absorptive recording medium can be used. The absorptive recording medium means that 30msec is from the start of contact in the above-mentioned "Bristow" method 1/2 The water absorption amount is more than 10mL/m 2 The recording medium of (1).
As the non-white recording medium, a transparent recording medium (transparent recording medium) can be cited. The transparent recording medium may be colorless transparent, colored (colored) transparent. In addition, transparent also includes translucent. These are recording media having a visible light transmittance. The recording medium is transparent to visible light. In this case, the recording method of the present embodiment allows the image formed on one side of the recording medium to be visually recognized from both sides.
Further, as the non-white colored recording medium, a non-white colored recording medium (non-white colored recording medium) can be mentioned. Examples of the recording medium include a non-white colored opaque recording medium and a non-white colored transparent recording medium. In this case, an image with good image quality such as visibility, filling, and deterioration in image quality can be easily formed by the recording method of the present embodiment. The non-white colored recording medium may or may not be the transparent recording medium. The non-transparent recording medium is a recording medium having no visible light transmittance. Further, the recording medium is opaque to visible light. Here, the non-white color is a color other than white.
2. Recording method
The recording method of the present embodiment uses the above-described recording apparatus, selects either one of the first recording mode and the second recording mode, and performs recording based on the selected recording mode.
The user can select the first recording mode and the second recording mode in advance, and the recording apparatus executes one of the first recording mode and the second recording mode in accordance with the selection. In this case, the recording mode may be selected in an operation section of the recording apparatus or a guidance setting screen of a computer that transmits image data of the recording apparatus and instructs recording.
As another method, the control unit of the recording apparatus may select and execute either one of the first recording mode and the second recording mode based on information on the recording medium and the recorded image data. In addition, when the control unit of the recording apparatus selects the first recording mode and the second recording mode, the control unit of the recording apparatus may have data for associating the recording medium and the recorded image data with the selected recording mode, and may select one of the first recording mode and the second recording mode based on such data and execute the selected recording mode.
In the first recording mode, the control section ejects the white ink composition and the non-white ink composition to adhere to the same scanning area in the same main scanning. Then, the recording medium is moved by the sub-scanning, and the next main scanning is executed.
In the second recording mode, the control unit ejects one of the white ink composition and the non-white ink composition to be attached to a certain scanning area in a certain main scanning. Then, the recording medium is moved by the sub-scanning, and the other of the white ink composition and the non-white ink composition is discharged in the next main scanning, and the other ink composition is attached to the scanning area where the one ink composition was attached in the previous main scanning.
Fig. 4 is a flowchart showing an example of a process of controlling recording by the recording apparatus used in the present embodiment. When the recording is started, the control unit of the recording apparatus determines the recording mode in step 400. The recording mode refers to a recording mode, a recording method, or a recording mode.
The determination of the recording mode is determined based on an input signal input from an external device such as a computer to the recording apparatus, or based on information input by a user to a user input unit provided in the recording apparatus. Here, the input signal from the external device or the input information from the user may be information directly specifying the recording mode, or information related to recording such as specification of the recording speed or specification of the image quality. The information related to recording is not limited thereto. In the latter case, the recording device records correspondence information in which a recording mode corresponding to information related to recording is previously determined in the recording device such as the control unit, and determines the recording mode with reference to the correspondence information.
In step S401, the determined recording mode is determined. In step S402 or S403, the recording apparatus is controlled under the recording condition corresponding to the recording mode according to the determined recording mode. The recording conditions are, for example, selection of a portion used for recording of the nozzle rows necessary for recording in the first recording mode or the second mode. Further, control related to the operation of the recording apparatus may be included. For example, the maximum amount of ink deposited, the conditions for primary drying, and other recording-related control conditions.
Recording is performed in step S404. The types of recording modes are shown in two types in the figure, and may be three or more types. As shown, the control of the recording apparatus may be performed before the start of recording, but may also be performed during recording. That is, recording may be performed in a state where the recording apparatus is controlled by the recording conditions.
Accordingly, by selecting the first recording mode or the second recording mode in accordance with the required image quality, recording speed, and the like, it is possible to perform image recording with excellent image quality and also perform recording with excellent recording speed.
In each recording mode, a primary drying step may be provided.
The primary drying step is as follows: the white ink composition and the non-white ink composition adhered to the recording medium are dried early by the drying means. In particular, the method is characterized in that the areas where the white ink composition and the non-white ink composition are adhered are dried early in the white ink adhering step and the non-white ink adhering step.
The primary drying step is a step of drying the ink adhering to the recording medium at an early stage. The primary drying step is as follows: the ink is used for drying at least a part of the solvent component of the ink to a degree of reducing the flow of the ink. The primary drying step may be performed so that the ink composition adheres to the heated recording medium, may be performed at a position of the recording medium facing the inkjet head, or may be performed at an early stage after the adhesion. The primary drying step preferably starts drying the ink droplets adhering to the recording medium within 0.5 seconds from the adhesion of the ink droplets.
The drying means in the primary drying step is not particularly limited, and examples thereof include a conduction type heating by a platen heater, a preheater, or the like, a radiation type heating by an IR heater, or the like, and a blowing type heating by a blowing fan, or the like. The air blowing promotes the evaporation by removing the evaporated solvent component from the medium, and the image quality is excellent. The air blowing type is not limited to hot air, and may be normal temperature air. In the case of the normal temperature wind, it is preferable not to have an influence of heat on the nozzle.
The drying mechanism is also referred to as a drying unit. One of these drying units may be used alone, or two or more of them may be used in combination. In particular, it is preferable to use either a conduction type or a radiation type, or a blowing type, and it is more preferable to use a conduction type or a blowing type. In this case, heating can be performed by either conduction or radiation, and evaporation is promoted by air blowing, so that the image quality is further improved. In this case, the air blowing may be hot air or normal temperature air, but from the viewpoint of more excellent discharge stability, normal temperature air is preferred.
The surface temperature of the recording medium in the primary drying step is preferably 25 ℃ or higher. Further, it is preferably 60 ℃ or lower. Further, it is preferably 30 to 50 ℃, more preferably 35 to 45 ℃, and still more preferably 40 to 45 ℃. Or preferably 30 to 40 c, more preferably 30 to 35 c.
The surface temperature of the recording medium in the primary drying step is set to the maximum temperature during recording.
When the surface temperature of the recording medium in the primary drying step is within the above range, the image quality and the like tend to be more excellent.
In each recording mode, a secondary drying step may be provided.
The secondary drying step is performed after the primary drying step for the purpose of further drying the recorded matter. The secondary drying step is drying for sufficiently drying the recording medium to which the ink composition has adhered to such an extent that the recorded matter can be used, and is drying for completing recording. The secondary drying may include heating for flattening components such as a resin contained in the ink composition. The heating is preferably as follows: after all the ink adhered to a certain area of the recording medium adhered, heating was started for more than 0.5 seconds from the completion of the adhesion.
The secondary drying step is also referred to as a post-drying step. The secondary drying step preferably uses heating. The surface temperature of the recording medium in the secondary drying step is preferably 50 to 120 ℃, more preferably 50 to 100 ℃, and still more preferably 60 to 90 ℃.
The drying method in the secondary drying method is not particularly limited, and examples thereof include a conduction type such as a platen heater and a preheater, a radiation type such as an IR heater, and a blowing type such as a blowing fan.
Fig. 5 shows a schematic cross-sectional view of the periphery of the inkjet head of the recording apparatus of fig. 1 viewed from the side. Fig. 5 also shows a drying mechanism and the like. The recording device 100 includes: carriage 2, inkjet head 3, platen 4, platen heater 4a, preheater 7, IR heater 8, blower fan 8a, rear heater 5, and cooling fan 5a. Recording is performed on the recording medium 1.
As the drying means used in the primary drying step, a conduction type using the platen heater 4a and the preheater 7, a radiation type using the IR heater 8, and a blowing type using the blowing fan 8a can be used. At least one of these is used to perform the primary drying step. In the blowing by the blowing fan 8a, the ink adhering to the recording medium can be blown to the recording medium in the vicinity of the position facing the ink jet head 4 in the recording medium conveyance direction to promote evaporation. The post-heater 5 is a drying mechanism used in the secondary drying process.
Examples
The present invention will be described in more detail below with reference to examples and comparative examples. The present invention is not limited in any way by the following examples.
1. Ink composition
The materials were mixed and sufficiently stirred in the compositions shown in table 1 below to obtain ink compositions. Specifically, the materials were uniformly mixed, and insoluble matter was removed by a filter, thereby preparing an ink composition. In table 1 below, the unit of the numerical value is mass%, and the total is 100.0 mass%. Unless otherwise specified, the amount of solid components is indicated. In addition, a pigment dispersion is prepared by mixing a colorant and a dispersant in advance and stirring the mixture, and the pigment dispersion is used for preparing an ink. A dispersant resin was used as the dispersant, and commercially available products suitable for each pigment were represented by pigment: the dispersing agent is 2:1, in a mass ratio of 1.
[ TABLE 1 ]
The values in the organic solvent () refer to the standard boiling point.
Joncryl 537J (acrylic resin pellets, manufactured by BASF Japan Co., ltd.)
Silface SAG503A (Silicone surfactant, manufactured by Nissin chemical industries Co., ltd.)
2. Example of recording
Tables 2 to 3 show recording methods used in examples. Table 2 shows the types of white ink compositions and non-white ink compositions used in the recording examples A1 to a14 in the first recording mode, and recording conditions such as the number of passes, the amount of adhesion, and the primary heating temperature. The primary drying temperature is a surface temperature of the recording medium when the ink heated by the platen heater is adhered.
With regard to recording example A14, the number of white-only passes was 3, which means that the amount of adhesion to the recording medium alone was 3m/inch at first 2 Under the conditions of (1) recording a white ink composition in 3 passes, and then, winding back the recording medium on which the white ink layer was formed, and recording 6mg/inch of a color in such a manner that the white ink layer was superimposed and 6 passes were simultaneously performed 2 And white 3mg/inch 2 . The ink adhesion amount is an adhesion amount in a2 × 2mm area in the recording pattern.
[ TABLE 2 ]
Similarly, table 3 shows conditions of the recording examples B1 to B11 in the second recording mode, and shows recording conditions such as the types of the white ink composition and the non-white ink composition used, the number of passes, the amount of adhesion, and the primary heating temperature. In the second recording mode, the white ink composition is first deposited by the number of passes and the amount of deposition in the table, the recording medium on which the white ink layer is formed is rewound, and the non-white ink composition is deposited by the number of passes and the amount of deposition in the table while being superimposed on the white ink layer.
As reference examples, a recording example C1 in which recording was performed only with a non-white ink composition and a recording example C2 in which recording was performed only with a white ink composition were also prepared.
[ TABLE 3 ]
3. Example of the device
As a recording apparatus, a serial type ink jet printer (trade name SC-S80650) changer was prepared. The nozzle density of each nozzle row was 600npi, the number of nozzles was 600, and the nozzle rows were ink jet heads arranged laterally in the main scanning direction. The resolution at the time of recording was 1200 × 1200dpi.
The number of ink droplets and the ink amount of the ink droplets per pixel are adjusted so that the deposition amount becomes a value in the table at the resolution. The number of ink drops per pass is also adjusted.
The recording apparatus is provided with a platen heater and a blower fan as shown in fig. 4. The wind speed of the blower fan was 2m/s near the paper surface, and the wind temperature was 25 ℃. The recording was performed under the set conditions by previously setting and measuring the temperature without the influence of the platen heater.
The heating intensity of the platen heater was adjusted so that the surface temperature of the recording medium became the value in the table.
Further, the recording medium (PET 50A (transparent film), manufactured by linke) was recorded with each ink composition in a predetermined amount of adhesion and number of passes under the conditions of each described example, and a solid image was recorded.
Thereafter, secondary drying was performed at 70 ℃ using a secondary drying mechanism. Thus, a recorded matter was obtained.
The number of paths described in tables 2 to 3 indicates the number of times the ink jet head passes through an arbitrary area when recording the area. For example, when the recording medium is moved by the sub-scanning by a distance of 1/6 of the length of the nozzle row in the sub-scanning direction, the ink jet head ejects the ink composition every six passes over an arbitrary region when recording the region.
As shown in table 4, the recording apparatus is set such that the control section of the recording apparatus executes each of the two recording modes. Each recording apparatus selects one recording example of the two recording modes and executes the selected recording examples in sequence.
The example of the recording apparatus shown in table 4 is an example, and the control unit of the recording apparatus may be set to execute any two of the examples shown in tables 2 to 3.
4. Evaluation of
4.1. Recording speed
The recording speed was evaluated based on the number of paths required for recording on an arbitrary portion of the recording medium according to the following evaluation criteria.
Evaluation criteria
S:4 route or less
A:5 to 7 routes
B:8 to 10 routes
C:11 to 13 routes
D:14 path or more
4.2. Visual recognizability
The recorded matter obtained in the above manner was placed on black paper, and the ease of visual confirmation of the image was visually observed, and the visual recognizability was evaluated according to the following evaluation criteria. Further, if the amount of white ink deposited is small, the hiding property of the image is insufficient, and the blackness of the lower black paper can be seen through, making visual confirmation difficult.
Evaluation criteria
A: it is easy to visually confirm.
B: slight blackening was observed but was easily visually confirmed
C: blackening was observed and it was slightly difficult to visually confirm
D: blackening was observed and visual confirmation was difficult
4.3. Color rendering property
The solid images of the recorded matter obtained as described above were measured for OD value using a colorimeter (i 1Pro2, manufactured by X-reite) under the following measurement conditions, and the color developability was evaluated according to the following evaluation criteria.
Measurement conditions
D50 light source, state T, standard observer 2 °, background: white paper
Evaluation criteria
S: OD value of 1.2 or more
A: OD value of 1.0 or more and less than 1.2
B: OD value of 0.8 or more and less than 1.0
C: OD value of 0.6 or more and less than 0.8
D: OD value less than 0.6
4.4. Uneven shade
The pattern image of the recorded matter obtained in the above manner was visually confirmed, and the density uniformity (shading unevenness) of the printed matter was evaluated according to the following evaluation criteria.
Evaluation criteria
S: uniform image without unevenness of shading
A: obtaining a good image without shading unevenness
B: obtaining an image without shading unevenness
C: uneven shading can be visually confirmed
D: has uneven shade and obvious brightness
4.5. Adhesion Property
The recorded matter obtained as described above was subjected to a chemical vibration type rubbing firmness tester (manufactured by tester industries, ltd.) such that a cloth was placed on the surface of the coating film, and subjected to a 500g reciprocating rubbing 50 times. The surface of the coating film after rubbing was visually observed for peeling and damage, and adhesion was evaluated according to the following evaluation criteria.
Evaluation criteria
S: non-peeling, almost non-cloth transfer
A: non-peeling, cloth transfer
B: having a peeling rate of 10 area% or less
C: peeling occurs, and the peeling rate is more than 10 area% and 50 area% or less
D: peeling rate of more than 50% by area
[ TABLE 4 ]
5. Evaluation results
As is clear from comparison between the examples and the comparative examples, in any of the examples including the first recording mode and the second recording mode, recording with excellent recording speed and recording with excellent image quality can be performed.
On the other hand, in all of the comparative examples, only either recording with excellent recording speed or recording with excellent image quality was possible.
For example, in embodiment 1, by performing the first recording mode, recording with an excellent recording speed can be performed. Further, by performing the second recording mode, recording excellent in both visibility and color rendering properties can be performed.
It is clear that the reference example has only a recording mode using only one of the white ink and the non-white ink, and is inferior in visibility and color developability.
Claims (14)
1. A recording apparatus for recording on a recording medium, characterized in that
The recording device includes:
a white ink jet head that ejects a white ink composition containing a white coloring material and attaches the composition to the recording medium;
a non-white ink jet head that ejects a non-white ink composition containing a non-white coloring material and attaches the composition to the recording medium; and
a control unit that performs control for executing recording by performing a plurality of main scans including: a scanning step of ejecting the ink composition from the inkjet head while moving the inkjet head relative to the recording medium and adhering the ink composition to the recording medium,
according to the control of the control section, the recording apparatus performs:
recording based on a first recording mode, the first recording mode being: forming a layer containing the white ink composition and the non-white ink composition by attaching the white ink composition and the non-white ink composition to the same scanning area of the recording medium by the same main scanning; and
recording based on a second recording mode, the second recording mode being: and attaching the white ink composition and the non-white ink composition to the same scanning area of the recording medium by different main scans, thereby forming a layer containing the white ink composition and a layer containing the non-white ink composition in a layered manner.
2. The recording apparatus according to claim 1,
in an area of the recording medium to which the white ink composition and the non-white ink composition are attached, a ratio of the amount of the white ink composition attached to 100 mass% of the amount of the non-white ink composition attached to the area where the amount of the non-white ink composition attached to the recording medium is a ratio A,
the ratio A1 of the first recording mode is smaller than the ratio A2 of the second recording mode.
3. The recording apparatus according to claim 1,
in the region of the recording medium to which the white ink composition and the non-white ink composition are attached, the ratio of the amount of the white ink composition attached to 100 mass% of the amount of the non-white ink composition attached to the region having the largest amount of the non-white ink composition attached to the region is a ratio A,
the ratio A1 of the first recording mode is less than 80 mass%.
4. The recording apparatus according to claim 1,
in the region of the recording medium to which the white ink composition and the non-white ink composition are attached, the ratio of the amount of the white ink composition attached to 100 mass% of the amount of the non-white ink composition attached to the region having the largest amount of the non-white ink composition attached to the region is a ratio A,
the ratio A2 in the second recording mode is 80% by mass or more.
5. The recording apparatus according to claim 1,
the content of the white coloring material is 8.0% by mass or more based on the total amount of the white ink composition.
6. The recording apparatus according to claim 1,
the white ink composition comprises an organic solvent,
the content of the organic solvent having a normal boiling point of less than 200 ℃ in the organic solvent is 50% by mass or more relative to the total amount of the organic solvent.
7. The recording apparatus according to claim 1,
the white ink composition comprises an organic solvent,
the maximum value of the standard boiling point of the organic solvent is 250 ℃ or lower.
8. The recording apparatus according to claim 1,
the white ink composition comprises an organic solvent,
the weighted average of the normal boiling points of the organic solvent is 200 ℃ or less.
9. The recording apparatus according to claim 1,
in the first recording mode, the main scanning is performed on the same area a plurality of times, and the main scanning is: a scan to attach the white ink composition and the non-white ink composition to the scan area.
10. The recording apparatus according to claim 1,
the white ink composition and the non-white ink composition are each a water-based ink composition or a solvent-based ink composition.
11. The recording apparatus according to claim 1,
the recording medium is a low-absorption recording medium or a non-absorption recording medium.
12. The recording apparatus according to claim 1,
the recording medium is a non-white recording medium.
13. The recording apparatus according to any one of claims 1 to 12,
in the first recording mode, the recording medium is,
forming a layer containing the white ink composition by a main scanning different from a main scanning for forming a layer containing the white ink composition and the non-white ink composition,
a layer containing the white ink composition and the non-white ink composition, and a layer containing the white ink composition are formed by lamination.
14. A recording method, characterized in that,
use of the recording apparatus of any one of claims 1 to 13,
selecting any one of the first recording mode and the second recording mode, and recording in the selected recording mode.
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| JP2021118578A JP2023014567A (en) | 2021-07-19 | 2021-07-19 | Recording device and recording method |
| JP2021-118578 | 2021-07-19 |
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| US20060158481A1 (en) * | 2005-01-19 | 2006-07-20 | Vutek, Incorporated | Method and system for multi-channel ink-jet printing |
| JP5593795B2 (en) * | 2009-12-15 | 2014-09-24 | セイコーエプソン株式会社 | Fluid ejecting apparatus and fluid ejecting method |
| JP2011201151A (en) * | 2010-03-25 | 2011-10-13 | Seiko Epson Corp | Printing apparatus, printing method, printing control method and computer program |
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